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-8z-7-3z=0-4
We move all terms to the left:
-8z-7-3z-(0-4)=0
We add all the numbers together, and all the variables
-8z-3z-7-(-4)=0
We add all the numbers together, and all the variables
-11z-3=0
We move all terms containing z to the left, all other terms to the right
-11z=3
z=3/-11
z=-3/11
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